package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = " loginCheckFilter", urlPatterns = "/*")
public class loginCheckFilter implements Filter {
    private static final String[] NOT_CHECK_URLS = new String[]{
            "/employee/login",
            "/employee/logout",
            "/backend/**",
            "/front/**",
            "/common/**",
            "/user/sendMsg",
            "/user/login",
            "/doc.html",
            "/webjars/**",
            "/swagger-resources",
            "/v2/api-docs"
    };
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;
        String uri = req.getRequestURI();
        boolean ifCheck = checkUrl(uri);
        if (ifCheck) {
            log.info("请求的uri: {}, 无需校验, 直接放行", uri);
            chain.doFilter(req, resp);
            return;
        }
        if (req.getSession().getAttribute("employee") != null) {

            log.info("请求的uri: {}, 用户已经登录, 直接放行", uri);

            Long currentId = (Long) req.getSession().getAttribute("employee");
            BaseContext.setCurrentId(currentId);
            chain.doFilter(req, resp);

            BaseContext.removeCurrentId();
            return;
        }
        if(req.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",req.getSession().getAttribute("user"));

            Long userId = (Long) req.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            chain.doFilter(request,response);
            BaseContext.removeCurrentId();
            return;
        }
        log.info("用户访问的uri为 {}, 由于用户未登录, 直接返回未登录结果, 跳转登录页面", uri);
        resp.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    private boolean checkUrl(String uri) {
        for (String notCheckUrl : NOT_CHECK_URLS) {
            if (PATH_MATCHER.match(notCheckUrl, uri)) {
                return true;
            }
        }
        return false;
    }
}
